Drilling-machine



2 sheets-sheet, 1.

(ModeL) 0. WREN.

' DRILLING MACHINE.

, Patented Sept. 5, 1882.

fnz/e'nio 7",

UNITED STATES PATENT OFFICE.

CHRISTOPHER VVREN, OF PLYMOUTH, PENNSYLVANIA.

DRILLING-MACHINE.

SPECIFICATION forming part of Letters Patent N0. 263,742, datedSeptember 5, 1882.

To all whom it may concern Be it known that I, CHRISTOPHER WREN, ofPlymouth, in the county of Luzerne and State of Pennsylvania, haveinvented a new and Improved Attachment to Drilling Machines, of whichthe followingis a specification, reference being had to the accompanyingdrawin gs.

higurel is a top view, showing all the parts in position for operation.Fig. 2 shows screw 1) detached. Fig. 3 is an end view of screw I). Fig.4 shows sleeve a detached. Fig. 5is a sectional view of sleeve a throughthe line D. Fig. dis a sectional view on the line A B. Similar lettersrefer to similar parts in all the views.

ais a tube or sleeve having slots 70 70 running lengthwise through itand bands 2' i around it. The bands't' 'i, the journals d d,

and the bevel-pinion 0 hold the parts of sleeve a together.

b is a plain screw of proper size to pass loosely inside of sleeve 11,having fixed pins m m in its ends.

'0 c are straight toothed bevel-pinions work-' ing at right angles intoeach other. a is fastened to shaft f, and c is fastened to sleeve a.Either of these pinions maybe made larger than the other, to give theproper speed to the drill and to adapt it to different kinds of work. 61d and d d are journal-boxes in the frame e c e e, in which the sleeve aand shaft frevolve.

d is a threaded box, fixed when in i use, through which the screw 11runs.

0 e e e is a frame fastened by means of posts 1) p to the body of themachine, and holding the shaft f and sleeve a in their relativepositions.

f is the driving-shaft, to which the crank g is applied in operating themachine.

-0 is the twisted drill.

Application filed June 12, 1882. (ModeL) The base R shown in thedrawings, and on which the model sits, forms no part of the machine, butis merely used to hold the parts in position to"sh0w them.

The machine is operated as follows: When the crank g is turned itrevolves the shaft f and pinion c. This sets in motion the sleeve at bymeans of the pinion c and as the sleeve a turns it carries with it thescrew b and drill o by means of the pins m m protruding into the slotsis it. As the screw b is turned in the threaded box 01 it is drawnforward by the thread, the pins m slide in the grooves 70 It, and thedrill 0 is fed forward into the coal or other substance being drilled.

Having fully described my invention, what I claim as new is-- Thecombination, in an attachment to mine drilling-machines for use in coalor rock, of the sleeve (1, having slots it cut length wise in it, andhaving a straight-toothed bevel-pinion, 0 fixed toit, the screw b,passing inside of sleeve a and having fixed pins min its ends, whichprotrude into the slots 70, the frame 0 e e e, having the journal-box dd and d d arranged in it, that the sleeve a and shaft fmzay rest andrevolve in them, and the shaft f, having a straight-toothedbevel-pinion, 0, fixed to one end, and fitted on the other end toreceive the crank g, witha screw-threadvd box, d, all substantially asshown and described, and to be applied as an attachment todrilling-machines to give motion toathe drill, and operating in a mannerwherein the power is applied at right angles to the direction of thedrill.

CHRISTOPHER WREN.

Witnesses:

WM. 'BEAcHAM, W. M. LEWIS.

